I think the biggest hurdle to the concept is showing that the “trade” part is possible, which (I think) means some causal link between decision and experience. That link can be in the future, or uncertain, or conditional, as in many of the test cases for various decision theories. But I don’t see any difference between defect or cooperate in the case where there’s no causal transmission of the choice, ever.
Another biggest hurdle is to show that “choice” has any meaning in a Tegmark multiverse. I think all agents both cooperate and defect, in different universes. In that case, your decision mechanism is discovery of which universe you’re in, not a narrowing of what universes exist.
I think the biggest hurdle to the concept is showing that the “trade” part is possible, which (I think) means some causal link between decision and experience. That link can be in the future, or uncertain, or conditional, as in many of the test cases for various decision theories. But I don’t see any difference between defect or cooperate in the case where there’s no causal transmission of the choice, ever.
Another biggest hurdle is to show that “choice” has any meaning in a Tegmark multiverse. I think all agents both cooperate and defect, in different universes. In that case, your decision mechanism is discovery of which universe you’re in, not a narrowing of what universes exist.